黄河下游不同峰型洪水对泥沙输移的影响  

Influence of flood wave type on sediment transport in lower reaches of Yellow River

作　　者：申冠卿[1] 张原锋[1] 曲少军[1] 尚红霞[1] 

机构地区：[1]黄河水利科学研究院,河南郑州450003

出　　处：《水利学报》2008年第1期7-13,共7页Journal of Hydraulic Engineering

基　　金：国家"十一五"科技支撑计划(2006BAB06B04);黄委会基础研究项目资助

摘　　要：黄河下游在洪水过程中的泥沙输移效果与峰型、含沙浓度和泥沙组成等因素有关。本研究在假定洪水经水库调控前后水体的含沙量和泥沙组成都相差不大,仅改变洪水过程线形状的基础上,从洪水调控的基本原则出发,考虑到洪水调控后输沙能力变化、水库的可操作性及下游漫滩程度等综合因素的影响,从机理上探讨了不同类型洪水的输沙效果,得出洪水调控系数λ≥0.32后,水库调控后的平头峰(恒定流量)并不比未经调控的自然洪水过程输沙效果差的结论。研究成果对小浪底水库科学调控水沙过程有参考意义。The transportation of sediment in the process of flood in lower reaches of the Yellow River is closely related to flood wave type,sediment concentration and composition of sediment.In this paper,the change of sediment transport capacity of flood due to the regulation of reservoir is investigated.The study is based on the assumption that the sediment concentration and sediment composition of flood after regulation are the same as those in natural flood wave,only the type of flood wave including its peak discharge and time duration is changed.It is found that if the ratio of flood peak discharge after regulation to that before regulation λ≥0.32,the sediment transportation capacity of flood after regulated as a steady flow will not lower than that of natural flood.This conclusion is helpful in optimizing the operation of Xiaolangdi Reservoir for enhancing the sediment transport in the lower reaches of Yellow River.

关 键 词：泥沙输移 不同峰型 水沙搭配 调控水沙 

分 类 号：TV143[水利工程—水力学及河流动力学]